Curling iron



FIG. 1 is a perspective view of a curling iron showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view; the right side is a mirror image thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a curling iron, substantially as shown and described. 